Drill-steel retainer



Patented Oct. 2l, 1930 UNITED STATES JOHN RENFER, F CLEVELAND, OHIO, ASSIGNOR TO THE CLEVELAND `ROCK DRILL1 COMPANY, or CLEVELAND, omo@f DRILL-STEEL nEVTAINER y Application flied March 12, 192s.` serial in.aci-,137.'v

The present invention is directed to improvementsin drill steel retainers.

The primary object of the invention is to Vprovide a device of this character so con- 5 structed that the same can be connected with one of the side lrods 'ofthe drill, thereby eliminating the use of additional fastening devices, and materially adding to the simplicity of the structure. l0

vide a device of this kind` wherein the shock incident to the drillV steel collar striking the retainer will be effectively absorbed, thus prolonging the life of the device. y

Another object of the invention is to provide a retainer capable of being easily and quickly swung to its open or closed position. While the drawing illustrates a preferred embodiment of the invention it is to be understood that in adapting the means to meet specific needs and requirements, the design may be varied and such other changes in the minor details of construction may be resorted to within the scope of the invention as claimed, without departing from the spirit thereof.

F or a full understanding of the invention and the merits thereof, reference is to be had to the following description and the drawing hereto attached, in Which,- f

Figure 1 is a side view.

Figure 2 is a front view. y

Corresponding and like parts are referred to in the following description and designated in the several views of the drawing byV like reference characters.

Referring to the drawing, 1 designates the front head of a percussive rock drill, and 2 and 3 the -side rods, the former being somewhat longer than the latter and is provided with an extension 4 upon its lower end, the purpose of which will be later explained.

The holder 5 for the retainerconsists of upper and lower substantially circular horizontally disposed flanges 6 and 7, respectively, integrally connected by a bar 8. These flanges are formed respectively, with lopenings 9 and 10, larranged in direct alinement with each other. The inner face of the bar 8 is formed with a longitudinal transversely Another object of the invention is toppro-k ciirvedfigroove 11in order to` snugly engage' thesidel rod spring v.12 in order to compactly4 assemble theparts.` A coil springil is used in connection withthe siderod 8, as ,iscustornar-yf The flange -7 has carriedthereby an integrally connected' hook'fll for pivotal engagementwiththe retainer15-`-fl The retainer 15 'is'formed fromiasingle blank of' suitable `metal and comprises*angu` larly disposed sections l16"and 17 the section 16 Ehaviiflg an opening `18 therein which'v "comev niiinicateswith theslot 19 lof the section 17.

The' diameter of the open-ing 18 is such'` that'v th'efco-llar'20j'of the drill steel 21 'can pass ytherethrough"inorder that the steel can be removed or replaced, while the width of the slotv 19 .is such as to prevent passage of the collar 20 therethrough. The section 16'of the retainer is further provided with an eye 22 for pivotal engagement with the hook 14 in order that the retainer can be conveniently swung open or closed.

The coil spring 12 used iny connection with the side rod 2 and holder 5 has a lug 23 upon its upper terminal whichengages a recess 24 formed in the lock washer 25 interposed between the nut 26 and said spring.

It will be noted'that the upper flange 6 normally engages the lshoulder 27 of the front head 1 and that the side rod 2 passes through -the opening 9 with the extension 4 engaged in the opening 10, and since the spring 12 'encircles that portion of the side rods between the flanges 6 and 7, the holder` will be yieldably maintained upon the side rod due to the presence-of the nut 26.

The eye 22` is engaged in the hook 14 and at which time the rim thereof will be held tightly in engagement with the extension 4 due to the resiliency of the spring 12, thereby preventing accidental disengagement of the holder 5. It will be obvious that when the v drill steel is rapidly projected forwardly and the collar thereof strikes the section 17, the

shock incident thereto will be absorbed owing to the fact that the holder may slide upon the side rods. This action of course contracts Since the retainer 15 is pivotaily connected to the hook 14 through the medium of the eye 22 said retainer can he Conveniently swung upwardly to a position to permit the drill steel collar 20 to pass through the opening 18 when Changing or replacing' steels, and down- Wardly in order to limit the outward movement of the steel.

Having thus described the invention, I claim:

1. The coinhinationwith the front head of a drill having a collared drill steel operatively associated therewith, of a side rod extending from the front head and having an extension, a holder slidahly and yieldahly connected with the side rod, a hook carried hy the helder, and a drill steel retainer pivotally connected to the hook and yieldably engaged with said extension.

2. The combination with the front head oi a drill having a collared drill steel operatively engaged therein, of a side rod extending from the front head and having an extension upon its extended end, a holder slidahly and yieid- :5; ably engaged with the side rod, ar hook carried by the holder, said extension extending into the hook, a drill steel retainer pivotally engaged with the hook and hy said extension.

In testimony whereof I atlix my signature.

JOHN E. RENFER. 

